脱式计算. 8.82×15-100 15.8-7/18+14.2-11/18 21.6-0.8×4÷0.8×4 33/5×3.7+3.6+5.3×33/5 2.5×4.4 (1.5+22/3)÷3.75-2/3.
问题描述:
脱式计算.
8.82×15-100 | 15.8-
|
21.6-0.8×4÷0.8×4 | ||||||||
3
|
2.5×4.4 | (1.5+2
|
答
(1)8.82×15-100
=132.3-100
=32.3;
(2)15.8-
+14.2-7 18
11 18
=(15.8+14.2)-(
+7 18
)11 18
=30-1
=29;
(3)21.6-0.8×4÷0.8×4
=21.6-3.2÷0.8×4
=21.6-4×4
=21.6-16
=5.6;
(4)3
×3.7+3.6+5.3×33 5
3 5
=3
×3.7+33 5
×1+5.3×33 5
3 5
=3
×(3.7+1+5.3)3 5
=3
×103 5
=36;
(5)2.5×4.4
=2.5×(4+0.4)
=2.5×4+2.5×0.4
=10+1
=11;
(6)(1.5+2
)÷3.75-2 3
2 3
=
÷3.75-25 6
2 3
=
×25 6
-4 15
2 3
=
-10 9
2 3
=
.4 9